title: Effect of temperature and density fluctuations on the spatially heterogeneous dynamics of glass-forming Van der Waals liquids under high pressure.
abstract: In this Letter, we show how temperature and density fluctuations affect the spatially heterogeneous dynamics at ambient and elevated pressures. By using high-pressure experimental data for van der Waals liquids, we examine contributions of the temperature and density fluctuations to the dynamics heterogeneity. We show that the dynamic heterogeneity decreases significantly with increasing pressure at a constant structural relaxation time (isochronal condition), while the broadening of the relaxation spectrum remains constant. This observation questions the relationship between spectral broadening and dynamic heterogeneity.
authors.affiliation: Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Koperwas
authors.forename: A
authors.initials: A
authors.lastname: Grzybowski
authors.forename: K
authors.initials: K
authors.lastname: Grzybowska
authors.forename: Z
authors.initials: Z
authors.lastname: Wojnarowska
authors.forename: A P
authors.initials: AP
authors.lastname: Sokolov
authors.forename: M
authors.initials: M
authors.lastname: Paluch